Fair Value Disclosures - Summary of Gains (Losses) Due to Changes in Instrument Specific Credit Risk for Loans and Other Receivables and Loan Commitments Measured at Fair Value under Fair Value Option (Details) - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2021	Feb. 29, 2020
Financial instruments owned:
Loans and other receivables	$ 10,696	$ 1,739
Short-term borrowings
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	0	57
Other changes in fair value	0	12
Long-term debt
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	(91,982)	29,432
Other changes in fair value	80,819	(37,642)
Loans
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	0	(610)
Loan commitments
Financial instruments sold, not yet purchased and Long-term debt
Changes in instrument specific credit risk	$ 0	$ (661)